BOLTED

Fórum na téma optimalizace
zajišťování šroubových spojů

Steam turbine inlet flange

steam turbine inlet flange nuts and bolts 2

Challenge: The main problem with this application was the time required for installation and removal. Each installation took about 24 man-hours utilizing heating rods and a 1-1/2″ impact. Removal required about 24-40 man-hours.

Solution: The application shown utilized (12) 2-3/4″ Superbolt multi-jackbolt tensioners (MJTs) with Flexnuts on the opposite side of the stud. Installation of the studs, tensioners, and Flexnuts required only 3 man-hours.

Only two workers were required for the job. Total tightening time after the Flexnuts and tensioners were seated was about 35 minutes. Eight jackbolts were tightened to 156 ft-lbs for a prestress of 45,000 psi.

Tightening with MJTs was completed in 35 minutes!

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